The darkest, quietest and cleanest places left on Earth

Haleakala Summit, Hawaii: Hawaii has some of the most consistently clean air on Earth — even bustling Honolulu gets good marks from WHO — and the ability to get up above the clouds into thinner, cleaner air on top of Haleakala, in Maui, means there is even better stargazing here than at sea level. Visitors can stay overnight to see the stars and take in the sunrise, giving you the best of both worlds. The Mauna Kea observatory on the Big Island is another superb option, although staying overnight is not possible there.

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Haleakala Summit, Hawaii: Hawaii has some of the most consistently clean air on Earth — even bustling Honolulu gets good marks from WHO — and the ability to get up above the clouds into thinner, cleaner air on top of Haleakala, in Maui, means there is even better stargazing here than at sea level. Visitors can stay overnight to see the stars and take in the sunrise, giving you the best of both worlds. The Mauna Kea observatory on the Big Island is another superb option, although staying overnight is not possible there.